Brake



J. W. TATTER BRAKE Original Filed Nov. 3, 1930 INVENTOR.

ATTORNEY.

Patented Dec. 15, 1936- PATENT OFFICE BRAKE John W. Tatter, Akron, Ohio, assignor, by mesne assignments, to Bendix Products Corporation, South Bend, Ind., a corporation of Indiana Refiled for abandoned application Serial No. 192,901, November 3, 1930. This application June l9, 1936, Serial No. 86,068

6 Claims.

This is a refile of my abandoned application Serial No. 492,901, filed November 3, 1930.

My invention relates to improvements in a valve mechanism for use in conjunction with hydraulic brake systems for automotive vehicles, said hydraulic systems being under atmospheric pressure when the brakes are in a released posi tion; and the objects of my improvement are, first, to provide a-valve mechanism that will permit the escape of liquid and air from and prevent the entrance of air into the hydraulic brake system; second, to provide a valve mechanism having an automatically operated valve together with means for locking said valve in a closed position; and. third, to provide a valve mechanism having a valve member with seat surfaces at each of its ends.

I attain these objects by the'mechanism illustrated in the accompanying drawing, in which:

Figure l is a side elevation of a brake shoe wig: a hydraulic wheel cylinder assembled therew1 I Figure 2 is a sectional view of the wheel cylinder taken on the line 2-2, Figure 1,

Figure 3 is a diagrammatic sectional view of the hydraulic master cylinder together with a brake pedal mounted thereon,

Figure 4 is a sectional view of the wheel cylinder taken on the line 44 of Figure 2,

Figure 5 is a diagrammaticview of an automotive vehicle equipped with a hydraulic brake system, and

Figure 6 is a partial end elevation of an automotive. vehicle disclosing the valve mechanism portion of the wheel cylinder together with means for conducting hydraulic liquid from the hydraulic system to a receptacle.

. Similar numerals refer to similarparts throughout the several views. A brake shoe is suitably mounted within the brake drums 2 andis provided with brake.

lining 3 for engaging the inner surface of said brake drums 2. The brake shoe is provided with brackets 4 in which is suitably mounted the wheel cylinder A which may be constructed integrally with the valve mechanism portion B which is provided with a threaded portion 5 for fastening the connection 6 to which is fastened the hydraulic liquid conduit I.

It is to be noted that each of the wheel cylinders A of the hydraulically connected brake system will be provided with the valve ,mechanism portion B, together with suitable connections for attaching the necessary hydraulic conduits.

The wheel cylinder A is provided with a cham" ber 8 which. is provided with the passage 9 which connects with the cylinder working chamber of the wheel cylinder A. Thepassage I0 is connected withthe chamber 8, and, through the threaded portion 5, with the hydraulic conduit l which'in turn is connected with the hydraulic brake system as hereinafter described. The valve mechanism portion B is provided with thechamber II which is connected with the chamber 8 by the passage l2.

The chamber H is adapted to receive the threaded member I3 which may be provided with a head portion M for suitable engagement with a wrench for screw operation thereof.

The threaded member I3 is provided with the recess l5 in which is slidably mounted the hexagon shaped member 5. The hexagon shaped member I6 is provided with the recess H in which operates the spring l8, the spring l8 seating on the inside end surface of the recess l5 of the threaded member l3 and on the inside end surface of the recess ll of the hexagon shaped member l6. I

The outer end of the passage I2 is provided .with a valve seat portion which is engaged by the conico-cylindrical portion it! of, the' hexagon shaped member It, the spring l8 always tending to maintain the conico-cylindrical por-- tion IS, in engagement with the valve seat portion of the passage l2.

The threaded member I3 is provided with the passage 20 which' connects with the recess IS. The threaded member I3 is further provided with a threaded end 2| to which may be fastened the connection 22 of a suitable drain tube 23. When the connection 22 together with the tube 23 have been removed, from its position as disclosed in Figure 6, after the hydraulic filling operation as hereinafter described, the threaded 'end 2| may be covered with a suitable cap member 24.

,In Figure 5 is disclosed, -in diagrammatic form, an automotive vehicle equipped with a 'hydraulic' brake system as above described, the automotive vehicle comprising the frame 25 ogether' with its. suitably attached front axle 26 and rear axle 21, the brake drums 2 being suitably attached to the wheels 28.

The master cylinder C is suitably attached to the frame 25 and is provided with a pedal lever 23 suitably connected to a shaft 30, as shown in Figure 3 to which in turn is suitably attached the lever 3| which engages and actuates the piston 32 which, in turn, is slidably mounted in the cylinder member 33 attached to the main master cylinder member 34.

Suitable means such as the spring 35 may provide for the return of the piston 32 to its initial or off position when the brakes are in a released position with no pressure being applied to the pad 36 of the pedal lever 29.

The cylinder member 33 is provided with a suitable passage, such as the hole 31 for connecting the cylinder working space 38 with the reservoir chamber 39 which may be filled with hydraulic liquid to the height as indicated by the line 40, in Figure 3. The cylinder member 33 is also provided with a passage to which may be suitably attached the connection 42 to which, in turn, are suitably connected the hydraulic conduit 43 connected with the wheel cylinder of the left front wheel brake, the hydraulic conduit 44 connected with the wheel cylinder of the right front wheel brake, and the hydraulic conduits 1, 45 and 46 connected with the wheel cylinders of the two rear wheel brakes.

When it is desired to fill the hydraulic brake system with liquid, the reservoir chamber 39 of the master cylinder C, is filled with hydraulic liquid to the height, as indicated by the line 40 in Figure 3 and the connection 22 together with its drain tube 23 is attached to the threaded end 21 of the threaded member l3, placing the lower end of the drain tube 23 in a suitable container 41, the threaded member l3 first being screwed out, however, to the position as shown in Figure 2, when the inner end surface of the recess l will be free of engagement with the outer end of the hexagon shaped member l6, thus providing communication between the clearance spaces around the hexagon shaped member 16, in the recess 15, and the passage 20.

It is to be noted that the master cylinder C will be provided with a suitable breather member 59 connecting the reservoir chamber 39 with the outside atmosphere.

By. applying hand or foot pressure to the pad 36 of the pedal lever 29, the pedal lever 29 may be depressed which will cause the lever 3| to move the piston 32 in the cylinder member 33,

thus forcing the hydraulic liquid that has flowed into the cylinder working space and the hydraulic system'through the hole 31 which connects the cylinder'working space with the hy draulic liquid in the reservoir 39 when the pedal lever 29 is in a released position corresponding to the off position of the brakes. When the pedal lever 29 is thus depressed, the hydraulic liquid will be forced through one of the lines 45, 44 or 43 to the wheel cylinder of which the threaded member l3 has been screwed open and to which the connection 22 and the drain tube 23 has been attached. The hydraulic liquid will be forced to flow through the passage l9, into the chamber 8, through the passage I2, and against the conico-cylindrical end [9 of the hexagon shaped member 16, the force of the hydraulic liquid raising the hexagon shaped member 16 from its valve seat by compressing thespring I8. Thus the hydraulic liquid will flow 'out of the passage I2 into the chamber II and through the clearance spaces around the outside of the hexagon shaped member I6 into the pas sage 20, through the drain tube 23 into the reservoir 41. As the, hydraulic liquid thus is forced out into the reservoir 41, it will carry with it any 'air that may be present in that portion of the hydraulic system leading to the particular wheel cylinder to which the drain tube 41 is connected.

It is to be noted that immediately the pressure is removed from the hydraulic liquid which has return the piston 32 together with the levers 3| and 29 to their released position in which the hydraulic liquid will again flow through the hole 31 into the cylinder working space of the cylinder member 33 when the pumping action of forcing the hydraulic liquidout through the drain tube 23 may again be repeated. After a few pumping strokes, as above described, the hydraulic liquid issuing from the drain tube 23 into the reservoir 41 will be a solid fluid mass with no air bubbles appearing therein. When all air bubbles cease to appear, that portion of the hydraulic system leading to the wheel cylinder to which the drain tube 23 is attached will have been properly filled. The connection 22 and the drain tube 23 may now be removed from the threaded end and replaced by the cap member 24. By applying a wrench to the head portion 14 of the threaded member l3, the threaded member l3 may now be screwed into the filling device portion B until the surface of the threaded member l3, at the inner end of the recess 15, contacts with the end surface of the hexagon shaped member l6, around the recess l1, thus positively locking the hexagon shaped member 16 on seats at both of its ends, thus closing the passages through the valve mechanism and preventing the escape of any further hydraulic liquid when the hydraulic brake system is used.

After this filling operation has been repeated for each wheel cylinder the complete hydraulic system will be completely filled with solid hydraulic fiuid and the hydraulic-system will be ready for use in actuating the Wheel brakes as above described.

What I claim as my invention is:

1. In a valve mechanism, the combination of a housing provided with a chamber having a passage connecting therewith, a member adjustably mounted in the end of said chamber of said housing and provided with a passage extending therethrough to connect with said chamber, a valve member provided with a surface for closing the connecting passage of said housing, said valve member being telescopically mounted relative to said first mentioned member and provided with a clearance space therebetween, and resilient means mounted between said first mentioned member and said valve member, and means for closing the passage through said first mentioned member.

2. In a valve mechanism, the combination of a valve housing provided with a bore, said valve housing being fixed against movement about'the axis of its bore, a valve member in the bore of said valve housing, said valve member being provided with a conical end and a fiat surface at its other end, said fiat surface extending at right angles to the axis of said valve member, said valve member being further provided with a plurality of straight surfaces extending from its conical end to its fiat surface at its other end, a

resilient member in said valve member, and a 7 member engaging said resilient member and the vided with a recess having an open end surflat surface of said valve member, said last menrounding the portion of said valve provided with tioned member extending around said valve said flat side, said movably mounted member bemember.- ing'adapted to engage the open end of said valve 3. In a valve mechanism, the combination'of a to lock said valve in its seated position for closhousing provided with a passage, avvalve meming the passage of said housing, said last menber provided with a conical end for closing the tioned member being provided with a passage expassage of said housing, said valve member being tending fromone of its ends to said recess.

provided with a recess, an adjustable member 5. In a valve mechanism, the combination of, being provided with a recess for receiving said a valve member provided with a conical seat por- '10 valve member, said adjustable member and said tion at one of its ends together with an annular valve member fitting together in such manner shaped end surface extending at right angles to as to provide a clearance space therebetween, the axis of said valve member, means for 'autosaid adjustable member being adapted to engage matically causing said valve member to seat on said valve member adjacent the end of the recess its conical portion, and adjustable means for of said valve member to lock saidvalve member causing said valve member to be seated at its in a closed position relative to the passage of annular shaped end portion, said valve member said housing, said adjustable member being probeing thereby locked in a seated position at both vided with a passage therethrough, the passage of its ends. of said adjustable memberconnecting with the 6. In a valve mechanism, the combination of recess of said adjustable member, and resilient a valve member suitably mounted, an adjustable means in the recess of said valve member between member provided with a passage therethrough said valve member and said adjustable member. together with a surface for contacting said valve 4. In a valve mechanism, the combination ofa member to close the passage through said adhousing provided with a passage therethrough, justable member, said adjustable member being a valve provided'with aconical seat for closing further provided with an annular chamber havthe passage of said housing, said valve being ing a greater cross section than the maximum provided with a fiat side extending from its conicross section of said valve member, and resilient cal seat, resilient means for forcing said valve means suitably mounted between said valve.

to a seated position for closing the passage of member and said adjustable member. I

said housing, a movably mounted member'pro- JOHN W TA'I'IER. 

